It's the XJ220 Engine Testbed from back in t'day.
All the gubbins on the dash (McDonalds wrappers, Daily Sport et cetera) are glued down.
Justin Law was caning it up the hill at the Festival Of Speed - was in the top 10 for most of the day.
Basically, it's a pre-production XJ220 with a Transit body...apparantly most of the 'engine testing' boiled down to taunting Porsche drivers.
The roof rack, the dashboard gumf, the football thingy on the mirror, the flag, the light...perfect!
*n